Integrated on-line door control system with standardized interfaces

A door access control system includes a pair of housings. One housing is mounted in the door. The other is mounted adjacent to the door in the surrounding frame. The one housing includes an inductor, control circuits coupled to the inductor and a door side interface. The other includes an inductor, control circuits coupled to the inductor and a frame side interface. The door side interface can be coupled to door mounted devices including a card reader, a request for exit interface and a lock interface. The frame side interface can be coupled to frame side communication links which in turn are coupled to a displaced door access control unit. Communication between housings can be carried out via the inductors.